KR950004576B1 - Process for the preparation of binder using thermoplastic resin and waste rubber - Google Patents

Abstract

The method is characterized by adding 0.01˜1.0 wt.% of a sodium hydroxide to the molten mixture of 20˜80 wt.% of a thermoplastic synthetic resin-molten solution and 20˜80 wt.% of a waste rubber powder or particle. The synthetic resin is pref. polyethylene, polypropylene, polystyrene, vinyl chloride resin, acryl resin or vinyl acetnte resin, and the waste rubber is pref. natural, synthetic, vulcanized or nonvulcanized rubber. The binding agent is used in the mfr. of an asphalt, a sound insulating board and a heat insulating board.

Description

Manufacturing method of binder using thermoplastic synthetic resin and rubber waste

The present invention relates to a method for producing a binder that can be used in building materials and civil engineering while firmly binding inorganic materials, pulp, fibers, straw, chaff, sawdust or various vegetable materials using thermoplastic synthetic resin and rubber waste. .

Conventional binders for building materials have been widely used, including cement, gypsum, asphalt, various synthetic resins and adhesives. However, cement is a binder for inorganic materials such as sand, fine stone, and gravel. It has been used to obtain innumerable structures such as brick blocks.

However, cement is not suitable for the cohesiveness of vegetable materials such as straw, fiber, rice hull, sawdust, etc. due to the mutual bonding problem, and gypsum itself has a cohesiveness in the presence of moisture, so it is used as a wallboard ceiling gypsum board. The water resistance and strength are weak, and the caking resistance is weak, so the use as a caking agent is extremely limited.

Asphalt binders have been used as a waterproofing material for adhering or painting the floor or wall of a structure, or as a laminating material for roofing paper, waterproofing plate or sheet. .

In addition, when various synthetic resins or adhesives are used as binders, physical properties such as binding strength (adhesive strength) and strength are excellent, but they are disadvantageous in terms of economy.

The binder according to this method can obtain excellent physical properties by using any materials as well as inorganic materials. Moreover, by using the discarded synthetic resin and rubber, it is possible to solve the pollution problem caused by the pollution of the natural environment, which has recently emerged as a big problem. It is a breakthrough in terms of economics and recycling of waste resources.

Attempts of the present invention have been aimed at recycling waste rubber as a caking agent, and thus, a synthetic solvent for dissolving rubber for industrial use by reusing solidified waste rubber as a liquid in order to recycle the rubber due to a change in state of rubber, It was liquefied by using organic solvents such as vegetable oil, animal oil, mineral oil, etc., but it was not possible to obtain a solidified state from it. In addition, heat-based liquid phase attempts to oxidize before reaching the dissolved state and carbonize in a non-oxidizing atmosphere to lose the physical properties of rubber. In other words, the melted synthetic resin is a heat medium that easily dissolves rubber in the liquid phase, and at the same time, a method of preparing a binder using the properties of the synthetic resin and the rubber.

As a result of the above problems, the present inventors can obtain a solidified state by dissolving and cooling the rubber in the thermoplastic resin solution by heat while searching for a substance that can dissolve the rubber and can be reduced to a solidified state in a solution state. Therefore, this invention was completed.

The present invention will be described in detail by melting the thermoplastic resin at each melting point and adding rubber powder or fine grains. It can be said to be a manufacturing method of the caking additive obtained by adding and stirring a trace amount of caustic soda, adding and dissolving fine grain.

The thermoplastic resins used in the above-mentioned methods are waste products of products formed of polyethylene, polypuroprene, polystyrene, vinyl chloride resin, acrylic resin, vinyl acetate resin, and the like. Natural rubber, synthetic rubber, vulcanized rubber, Waste products of non-vulcanized rubber are used. The mixing ratio is 80% -20% of rubber, 20% -80% of thermoplastic resin, and 0.01% -1% of caustic soda is added to the mixed solution.

In the above compounding ratio, the amount of waste rubber added increases the impact resistance elasticity in the solidified state, and the increase in the amount of waste thermoplastic resin increases the physical properties of shape retention, glossiness, formability, and surface strength. In addition, the purpose of adding caustic soda is to desulfurize in the dissolved state of the vulcanized rubber, and when used as a caking agent of other materials, the binding force or adhesion and durability are greatly improved, which is added for the modification of aged rubber.

The binder prepared in this way can obtain various construction materials by firmly binding the inorganic material or the organic material. Such secondary products have excellent physical properties such as water resistance, impact resistance, formability, and nail, planer, sawing, etc. Excellent workability. In addition, the binder prepared by the method or the secondary product obtained by using the binder is a revolutionary invention in terms of eliminating pollutants and recycling most of the discarded products, and helps to understand the present invention. For example, the embodiment carried out using the binder according to the present invention.

(Example 1)

700 kg of the waste polystyrene film was melted at a temperature of 180 ° C., and then 290 kg of waste rubber and 10 kg of caustic soda were completely dissolved while maintaining the temperature, thereby obtaining a black flowing binder. As a result of using the road paver by adding 600 kg of sand 400 kg fine stone (5 mm-20 mm) to the above-mentioned 1000 kg of the binder in the fluid state, the problem did not occur even after two years.

(Example 2)

550 kg of the discarded PVC was melted at a temperature of 200 ° C., and then 440 kg of waste rubber and 10 kg of caustic soda were completely dissolved to obtain a flow binder. 100 kg of the caking additive of the above-mentioned flow state was mixed with 150 kg of sawdust or rice hull, respectively, and uniformly mixed, and then press-molded by a press to obtain a plate-like body. By cooling and solidifying this, the soundproof board or heat insulating board which consisted of chaff or sawdust was obtained.

As described above, the binder in the present invention may be used as a substitute for asphalt depending on the mixing ratio, and may be referred to as a binder capable of mixing materials that can be widely used in civil engineering materials, construction materials such as waterproofing plates, soundproof plates, as well as waterproofing agents. have.

Claims (1)

In a molten mixture in which 20-80% of rubber powder or particles are added and deposited in a synthetic resin melt melted in a solution state of 80-20% by weight, molten sodium 0.01% -1% is added to the molten mixture. Method for producing a binder characterized in that.